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<p>Geometric discontinuities and welding-induced defects in welded structures often lead to localized stress concentrations and reduced fatigue strength. Post-welded geometric treatment (PWGT), such as weld toe grinding and TIG dressing, can enhance fatigue performance. However, quantifying the fatigue improvements remains challenging. By taking advantage of existing fatigue tests and equivalent traction stress(ETS), this study systematically investigates the influence of joint types, plate thicknesses, loading modes, and base materials on the fatigue behavior of PWGT joints. The results indicate that the ETS can characterize the effects of PWGT joint geometry, thickness, and loading mode. In addition, the base material effects on fatigue behaviors of PWGT joints are also addressed by classifying materials into two groups, i.e., medium-strength (MSS) and high-strength steels (HSS) with a demarcation yield strength of 550<i>MPa</i>. The S-N slopes associated with MSS and HSS are different as a result of statistical analysis. Finally, two sets of S-N curves (MSS and HSS) are proposed for quantifying the fatigue performance of welded structures with PWGT and applied on full-scale I-beams with cope holes for validation purposes.</p>

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Traction stress-based master S-N for predicting fatigue lives of geometric-treated welded joints

  • 期刊论文

  • 发表日期：

    2026年7月8日

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  • Shizhu Xing,
  • Fuhao Lu,
  • Xiufeng Li,
  • Hanqing Lu,
  • Senmiao Qiu

摘要

Geometric discontinuities and welding-induced defects in welded structures often lead to localized stress concentrations and reduced fatigue strength. Post-welded geometric treatment (PWGT), such as weld toe grinding and TIG dressing, can enhance fatigue performance. However, quantifying the fatigue improvements remains challenging. By taking advantage of existing fatigue tests and equivalent traction stress(ETS), this study systematically investigates the influence of joint types, plate thicknesses, loading modes, and base materials on the fatigue behavior of PWGT joints. The results indicate that the ETS can characterize the effects of PWGT joint geometry, thickness, and loading mode. In addition, the base material effects on fatigue behaviors of PWGT joints are also addressed by classifying materials into two groups, i.e., medium-strength (MSS) and high-strength steels (HSS) with a demarcation yield strength of 550MPa. The S-N slopes associated with MSS and HSS are different as a result of statistical analysis. Finally, two sets of S-N curves (MSS and HSS) are proposed for quantifying the fatigue performance of welded structures with PWGT and applied on full-scale I-beams with cope holes for validation purposes.